Rock-drill.



306K DRILL.'

APPLICATION FILED MAR-10, 1906.

JACKSON.

ROCK DRILL.

APPLIOATION FILED MAR, 1o, 1906.

Patented Apr. 6, i969.

2 SHEETS-SHEET 2.

INVENTUR.

Cum/vm. STAI: KSU am striking' position occupied by it in Fig. 1.--

" barrel back of the port 26.v -As a result each the hammer is not quiteparallel to the tool i 'ave shown this/clutch between the worm 30 ifally opposed 4longitudinally eXtendingIslots 27 into whichextend keysor. ribs 28l of 5a tool sticksthe hammer. member flies back member -11rotates.

1I have provideda shaftl also las loosely mounted upon it a gear wheel32 which is tionof the casing surrounding the body ofthe directionindicated by the arrow, each 1 hammerl 13 is moved by centrifugal forcefrom whatever lposition it may be into the The outward movement of theymembers 13 are cushioned by the washers 21.

When each hammer member strikes the adjacent end of the piston 14 thehammer slides back in its barrel 12. The backward movement or rebound'of each hammer at this time is cushioned by air in the portion of'its'blow is struck without greatly jarrinv. the apparatus, The relativemovement oiP separation after impact between the hammer member `andpiston is always sulicient toallow the hammer to clear the tool. If thefarther than it might otherwise do. I prefer to arrange the hammerandpiston so that.

andthe last gear 32 of the train, but it is evident that this clutch maybe laced between any two of the members w iich go tc makeup thevconnections between the memberl-"l and the piston.

The piston 14 1s provided lwith diametricworm wheel or gear 29 wherebythe gear is slidably but-non-rotatably mounted on the piston. The gear29 meshes with a worm 30 keyed-to a-shait 31 j ournaled in the frame andextendin parallel to the shaft 10. The

geared to the shaft l() through gears 1 33. The gear v wheel 32 drivesthe shaft 31. through a friction clutch comprising the frictionsurfaces'34 and 35, spring 36 and adjustable abutment 37'. .f

A chamber 38 is formed in the barrel por- .chamber 38 andthe'bore 440ithe tool 43 vreceiving socket. j A. i providedfwith a shoulde I and withan enlarged:l portion` subst' through slots formed yfor the shoulder45'.

Imoved backward Fig.' 1 by the springs 49 I tgwillfhe-under-'f frame 1is'- advancedffasthe,

the vpiston 14 through which a fluid 4is admitted from a suitablereservoir or p -np through the pipe 39 connected to the cover member 40.y Preferably Athe fluid employed iswater, 4though air may be used undersome circumstances. To. prevent escape of lthe fluid entering thechamber 3S along the'si'irface of the iston, packing members 41 are.Should the tool stick the I `nection between the gear 32 andthe-shaft'. 3.1

employed w ich are held in place by a helical spring 42.

shown, in Fig. 3 the forward end of the iston member 1`4'i'sprovided'with a socket into which the hollow drill` bit or other v{ ool43'is mserte'd. passage54 in thepi establishes communication between Itubularackingv44 is provided -forpr venting lea ageol thefluid out oftheto The tool 43. Vis n which abuts against the end ofjthe'pisto.

tially rectangular in crossesection which ters a corresponding recess465m` 'the' end-oi 1 the piston 14. The outer end ofthe-piston 14 islocated Within a chambered'c1'oss'lbe ad v i member 47 which isconnected to the casing lAs shown, helical springs 49 A -the bolts 48and extend between f 1 by bolts 48. surround the forward surface ofthecross-head andI nuts 50` carried atl the forward ends of thev r bolts. iTo securev the drill bit 'in place-a 1 1-,4

shaped' device 51` is employed whichpassesl forward end of tliecross-heaYmember. andifiio straddles thedrill bit or tool in frontof the 'Y headinthe 1position shown clearly -in'Fi'a 1 and 4.at w backward. limit oflits movement with the shoulder 52 formedbnv it engaging -ftheforpvWardlen'd ofthe barrel portion ofthe 'casing y1 surrounding the piston.'teninor member .51l is shaped and arrangedto hoId thejdrill bit firmlyin the socket'm the piston..

In'the normal operation of the device the motor 7 rotates the shafts 10and 31 and' lcauses vthe hammer members to deliver,

ich time'the piston 14;is atl he key .or fas-l y In the *stationary.position of." l the apparatusthe lsprings 49 hold the crosse'L rapidblows upon' the inner end of the pis.

to'n 14.

of the Worm-wheel 30. is obtained. This resul'ts 'in afslow rotation ofthe piston 14 and the tool 43. i At 'each' blow on the inner end of thepiston 14 the piston and drill'bit'arev advanced more orless working.`lAfterv each blowjy the" piston-fis to the position shown fin stood thatthe material upon'` 'which theftoclisbperating is' The -iuidenteringthroughfthe,v pipeQ. passes' outward to theuf'orkmg. edgeof Pthetool and causes the chips lformed-by the tool to be forced awaifrom itscutting'- edge. lith .the vtool s depending on the-na-` ture of thematerial onwhiclr the toolis" The rotation of the shaft 10 causesf thegear wheel 32 to be'revolved and throughV the friction 'clutch acorresponding rotation;

Vown. theyA may escape through the passages 53 formed in thetool. f

yields and prevents stripping of the gears .or

rictionclutch cony standoointe of durability orner-i other injury of theapparatus-- Should the tool not be in contact with the Work, et theinstant the pieton is giyena hammer blow' the entire energy of the blowis tal/ien '1ro by the belier. springs 49.

The construction hereinbefore" described and illustrated has been foundin. 'actual practice to give excellent resuitsfrern the andeiiectiyeness. it will be obvious, however, to those ASkilled in the nrtthat changes may be made in the forni oi vmy invention Withoutdeparting' roni its spirit, und that certain features or .my

at one side of a line radial tothe exis of ro- Vline of movement of thehammer.

incr member tation ci the body and perpendicular to the In combination,a rotating ing e cylinder formed in it, the axis of which is tangentialto the axis Aof rotation, a l1amlocated in said cylinder and iree tomove axially therein under the actie of centriiugaliorce, the center ofgrayityroi Said hammer member being at one side of e. line .'ailial torthe axis of rotation of said body and perpendicular' to the lineoffn'rove ment of the hammer.

in combination, a rotating body having a chamber formed in it, a hiimmermember located. in said chamber and free to'niove axially therein underthe action oicentriingel torce, the conter oi gravity oi said hambodyhav@ `mer member being et one side of a line radial to the axis ofrotation and perpendiculaithe line of movement of the liamn'ier, odevice 'in position to be struck vby said hammer, an(` inea-ns forcushioning the han,

nier when it rebounds 'after each blow.

in combination, a rotating body having a pair of hninmer receivingchambers formed in it, said chambers being located one at each side ofand'ecuidistont lromthe axis oi' rotation of said bm y, and two hammermem-- bers one located in each or" saideben'ibers and eech free to havea limited movement in its chamber in a line tangential to a circleabontsaid axis es a center.

5. in con'ibination, a rotating body, and a hammer member elidablymounted in'guide ways permitting of a limited movement of said memberwith respeetto said body in a direction tangential to a circle about theaxis of rotation oieaidI body as a center.

ii. combinotion, e rototingbody having a chamoer formed in it extendingtangential to a circle about 'the eine rotation oi said body cer-iteeliamnier iernber free' to here lin'iited movement in seid cheniber,seid hemmer member having a rcenter oi gravity at eil at one eine oi eline radial to the axis oi rotation oi' the body and perpendicuiar tothe 'iine of movement of the hammer.

'7. ineomb' etion. a rotating body hey/ing ve cheinber formed .in itextending tengentiaily to a circle abonttbe eine oi rotation 'of sindbody ae a centen-end a hammer member located in seid chamber end free tohave e limited increment therein in tbe direetionoi the length oi thechamber, the center of gravit, of seid member being at all timee'et oneside of a line radial to the axis of rotation oi' said body ondperpendicular to the line of movement of the lienimer.

. in combination, e rotetlng body, a

member olidinglyconneeted thereto to have a -iirnited movement withrespect to seid body in e direction .engontial to e, circle drown aboutthe erde of roteticn et' tire body as a center,

the member being' lie-ld et the forward linnt its noyenient havingreference 'to the directx rotation oi the body, and e de vice inposition to be Struck by the seid -hexrnner once in eeen revolution ciseid body.

in a roeii diifii or the like, a tool, a rotating body the eine oi whichie et right angles o to the line oi movement oi the tool, one or moree'siieinbers formed ineeld body, and e 1nenfnner member siidingiylocated in eeeb cheminer end oriented to be moved by centriingel torcewhen said body rotated into the position in wbich it *ti/iii strike saidtool..

l0. in combination, o rotating body hay ing e, cnen'iber i'orniedin it,n hammer member located in said chamber and free to more from one poe'on therein to another position under the action oi centrifugal force, ade- 'yice in e position to be strucii by said. hemnier, ond ineens :forcushioning the hammer when it rebounds at each blow.

l l. In combination, e tool,` a rotating body having e chamber formed init, a hammer member comprising a piston located in e id chamber and aportion projecting therefrom, said hammer itu-)ingl so arranged thatcentrifugal torce norm-:illy tends to move the pieton into e 'positionin which said projecting portion is adapted to engagesaid tool, e portleading from seid chamber, said port being exposed when the hammer isin' striking position but closed when the nanimer is moved back fromsaid position.

i2. in combination, a rotating body hay .ing e chamber formed in it, anda hammer member reciprocating in a straight line and locatedin saidchamber, said member being' moved into a striiiingposition by the actionof; centrifugal force and capable of yielding out of the strikingposition et each biow l strnek bv it.

striking position by centrifugal force, seid member having en eirchamber et onefside of seid. hammer for cushioning and limiting themovement thereof out of the striking position. .V v

l5. In combination., e rotating body, e hammer member se'eured theretoso that it is tree.to .be moved outoi the striking nosition bytherebound at each herinner blow imported and to be returned to thestriking; position by. centrifugal foree, und resilient Ineens forlimiting the movement out of the striking osition, saidmeenseoniprisingen stir chem er, and e ort therefor open when theheinrner is in t estriking 'l osition. sind closed by the movement of the ifnnrner out othe striking position.

i6. in combination, e rotating body, hammer .member siideblyv mounted onseid 4body and eepeble of limited movement e. tangential direction, andIneens for oushioning the movements oi seid herinner.

l?. In. combination, nv rotating body, e herinner member slidoblysecured theretoso einem that it isiree to bemoved out of the striking fposition by .the rebound at each hammer bioW and to be returned to thestriking-position by Aeentrifngal force, said body having an oirehe-miner for cushioning the movement, of'

i'zhe hammer ont of the striking osition, and 45 e port .ieeding fromsaid chain er, the port being so proportioned and arranged that 1t isopen when the herinner is in the strikin posit-ion end is closed by themovement o Athe hammer out of the striking position.`

13., In. combination, e rotating body hav; ing chamber therein, end a,hammermeinv ber iooseiy arranged in seid chamber for ited bodily.movements in e direction. ten"- gentiel to e circle about the4 exis ofrotation oi. said body. y o Y i9. in combination, a rotating bodyhavg-jing e oharn'ber formed in it, a hammer meinber located. in seidohernberV and free to move-f bodiiy from one position therein. toanother Go position under the action of centrifugal force, l 1 v edevice in s. position to be struck by seid.

herinner, and .ineens for cushioningthe haminer when it reboundseteachblow. y i. I,

20. in combination, e rotating member, e eentrifugellyeotueted hammerdevice vslidi ably mounted on theniember and freer to o have e iirnitedbod-ily movement with ree'peot to the vmember in etengentiei'direei'ineens tor cushioning the movements or; sind 70 herinner device,

.ln Witness whereof I have hereuntoset my hond this 5th dey of March,1906.

orient-n nA torreon "Witnesses .n-Jnriirniinomrr A; J.. .lnnnznn

